There is a workaround I was made aware of recently which uses the API on the UCS server to make a call directly to obtain the Java KVM console. I have tested this and although you don't get the GUI, you get the full console functionality (turn on/off, mount virtual images to upgrade, etc):
https://<CIMC_IP>/kvm.jnlp?cimcAddr=<CIMC_IP>&tkn1=<CIMC_username>&tkn2=<CIMC_Password>
The result will prompt you to download the jnlp file that upon execution will use Java to open the KVM console for you.
The process can even be automated (see python script below as an example). The call used in the script to aaaGetComputeAuthTokens still works for newer CIMC versions where the above call with the in-line user/pass only works for the older CIMC in the M3 servers.
import argparse
import os
import sys
import socket
import requests
import xml.etree.ElementTree as ET
parser = argparse.ArgumentParser("Launch KVM on a UCS system")
parser.add_argument('-n', '--node', help='UCS management IP', default=None)
parser.add_argument('-u', '--username', help='Username', default="admin")
parser.add_argument('-p', '--password', help='Password', default=None)
extraParams = {}
args = parser.parse_args()
mandatoryMissing = False
if args.node == None:
mandatoryMissing = True
print("Please provide -n <UCS management IP>")
if args.password == None:
mandatoryMissing = True
print("Please provide -p <password>")
if mandatoryMissing:
sys.exit(-1)
urlCimc = "https://{}/nuova".format(args.node)
loginXml="""<aaaLogin inName='{}' inPassword='{}'></aaaLogin>""".format(args.username, args.password)
headers = {'Content-Type': 'application/xml'}
loginResponseTree = ET.fromstring(requests.post(urlCimc, data=loginXml, headers=headers, verify=False).text)
getAuthXml="""<aaaGetComputeAuthTokens cookie="{}"/>""".format(loginResponseTree.attrib['outCookie'])
getAuthResponseTree = ET.fromstring(requests.post(urlCimc, data=getAuthXml, headers=headers, verify=False).text)
tokens = getAuthResponseTree.attrib['outTokens'].split(",")
runCmd = 'javaws "https://{}/kvm.jnlp?cimcAddr={}&cimcName=KVM&tkn1={}&tkn2={}"'.format(args.node, args.node, tokens[0], tokens[1])
print('Running {}'.format(runCmd))
os.system(runCmd)
The full IMC API can be found here:
https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/api/4_0/b_Cisco_IMC_api_40.pdf
An alternate browser (Pale Moon 32-bit) and old Flash version (32-bit 32.0.0.371 from May 23, 2020) can be used to follow the official statement steps and get the GUI to work, but I would discourage it greatly due to the vulnerabilities Flash has, which is the reason why it got pulled in the first place.
